why copper and silver metals occur in nature, in free as well as in the combined state while sodium, potassium, calcium, etc. are found in the combined state?
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because sodium, potassium and calcium are highly reactive and form oxide with oxygen which can be toxic to health
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only copper and silver reacts if pressurised. Gold, and Platinum do not react with anything they are called noble metals. Silver reacts with only a few elements.so, copper and silver are found in free state.
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